Rockwell Dh 485

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33004016 03/2009

Schneider Electric

AB DH485 ProtocolXBT N/R/RT

03/2009


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© 2009 Schneider Electric. All rights reserved.


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Table of Contents

Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5About the Book . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Chapter 1 Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Chapter 2 Operating Principle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11General Information on Bus Communications. . . . . . . . . . . . . . . . . . . . . . 12

Operating Principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Chapter 3 Software Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 15Vijeo-Designer Lite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Protocol - AB DH485 Dialog Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Configuring Equipment Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Equipment Address Dialog Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Chapter 4 Variable Types Supported . . . . . . . . . . . . . . . . . . . . . . . . 23Variable Types Supported. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Chapter 5 Cables and Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . 25Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26SUB-D 25 Pin Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Chapter 6 Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33XBT Detected Error Indication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Appendices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37Appendix A RS232/RS485 Recommendations . . . . . . . . . . . . . . . . . . 39

RS232 Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

RS485 Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45


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§Safety Information

Important Information

NOTICE

Read these instructions carefully, and look at the equipment to become familiar with

the device before trying to install, operate, or maintain it. The following special

messages may appear throughout this documentation or on the equipment to warn

of potential hazards or to call attention to information that clarifies or simplifies a

procedure.


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PLEASE NOTE

Electrical equipment should be installed, operated, serviced, and maintained only by

qualified personnel. No responsibility is assumed by Schneider Electric for any

consequences arising out of the use of this material. © 2008 Schneider Electric. All Rights Reserved.


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About the Book

At a Glance

Document Scope

This document describes communication between automation systems and the

XBT N/R/RT product range using the AB DH485 protocol.

Validity Note

The data and illustrations found in this document are not binding. We reserve the

right to modify our products in line with our policy of continuous product

development. The information in this document is subject to change without notice

and should not be construed as a commitment by Schneider Electric.

Related Documents

You can download these technical publications and other technical information from

our website at www.schneider-electric.com.

Product Related Information

Schneider Electric assumes no responsibility for any errors that may appear in this

document. If you have any suggestions for improvement or amendments or have

found errors in this publication, please notify us.

No part of this document may be reproduced in any form or by means, electronic or

mechanical, including photocopying, without express written permission of

Schneider Electric.

Title of Documentation Reference NumberXBT N/R/RT Instruction sheet W916810140111

A07

XBT N/R/RT User Manual 33003962

Vijeo-Designer Lite Online help


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All pertinent state, regional and local safety regulations must be observed when

installing and using this product. For reasons of safety and to ensure compliance

with documented system data, only the manufacturer should perform repairs to

components.

Since the XBT N/R/RT terminals are not designed to pilot safety critical processes,

no specific instructions apply in this context.

User Comments

We welcome your comments about this document. You can reach us by e-mail at

[email protected].

Compatibility


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Compatibility

Compatibility

Overview

The DH485 protocol available for XBT terminals can be used to communicate with

the following Allen Bradley process controllers:

SLC-5/0X PLCs

Micrologix


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Compatibility

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OperatingPrinciple

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Operating Principle

Overview

This chapter describes the operating principle of XBT terminals in applications using

the AB DH485 protocol.

*For additional information, refer to NEMA ICS 1.1 (latest edition), Safety Guidelines

for the Application, Installation, and Maintenance of Solid State Control

What's in this Chapter?

This chapter contains the following topics:

WARNINGLOSS OF CONTROL

The designer of any control scheme must consider the potential failure modes

of control paths and, for certain critical functions, provide a means to achieve a

safe state during and after a path failure. Examples of critical control functions

are emergency stop and overtravel stop.

Separate or redundant control paths must be provided for critical for critical

control functions.

System control paths may include communication links. Consideration must be

given to the implications of unanticipated transmission delays or failures of thelink.*

Each implementation of a Magelis XBT N/R/RT must be individually and

thoroughly tested for proper operation before being placed into service.

Failure to follow these instructions can result in death, serious injury, or

equipment damage.

Topic Page

General Information on Bus Communications 12

Operating Principle 13


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Operating Principle

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General Information on Bus Communications

OverviewThe XBT terminals can be connected to PLCs using different protocols. This

document describes the communication using the DH485 protocol with the XBT

terminal acting as client.

Roles of XBT Terminals

The terminals are usually connected to a communication equipment (PLC or other)

via a field bus. The XBT and the PLCs work autonomously of each other.XBT terminals perform the following functions:

monitoring function: XBT terminals visualize the processes that are active in the

PLCs and indicate alarm states

command function: XBT terminals send information to the PLC upon user request

Roles of Buses

A bus system provides the possibility to connect different devices via a uniquecabling.

Roles of Protocols

The protocol defines the language that is spoken by all the equipment connected to

the bus.


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Operating Principle

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Operating Principle

OverviewThe DH485 protocol is an Allen Bradley communication protocol.

The link between the XBT terminal and the Allen Bradley PLCs is one of the

following types

point-to-point

multidrop

WARNINGUNINTENDED EQUIPMENT OPERATION

The protocol must be installed and used by authorized and properly trained

personnel.

Failure to follow these instructions can result in death, serious injury, orequipment damage.


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Operating Principle

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Software Configuration

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3Software Configuration

Overview

This chapter contains the protocol parameters you must configure in the Vijeo-

Designer Lite software for operating XBT terminals in DH485 applications.



Topic Page

Vijeo-Designer Lite 16

Protocol - AB DH485 Dialog Box 18

Configuring Equipment Addresses 20

Equipment Address Dialog Box 22


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Vijeo-Designer Lite

OverviewUse the Vijeo-Designer Lite software to configure your XBT terminal for DH485

protocol applications.

Opening the Protocol - AB DH485 Dialog Box

To open the Protocol - AB DH485 dialog box in Vijeo-Designer Lite for setting the

protocol parameters, proceed as follows:

WARNINGINCOMPATIBLE SOFTWARE

Use only Schneider Electric manufactured or approved software to programhardware.

Failure to follow these instructions can result in death, serious injury, or

equipment damage.


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Step Action

1 Start Vijeo-Designer Lite.

To create a new application, continue with step 2, if you have already created a DH 485 application, skipsteps 2 and 3 and execute step 4.

2 From the application browser on the left-hand side of the Vijeo-Designer Lite window select the item

Configuration→ Terminal & Protocol.

Result: The following dialog box will be displayed on the right-hand side of the Vijeo-Designer Litewindow.

3 From the Terminal Protocol list in the lower right corner select the item AB DH485 and click Apply.

4 Select from the application browser the item Protocol - DH485.

Result: The dialog box Protocol - AB DH485 will be displayed on the right-hand side of the Vijeo-

Designer Lite window where you can configure the protocol parameters for DH485 communication.


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Protocol - AB DH485 Dialog Box

PurposeUse this dialog box to configure the protocol parameters for DH485 communication.

Representation

Elements of the dialog box

Element Description

Communication

Transmission Speed Select the transmission speed (in bit/s) on your

DH485 bus from the list. Make sure to configure the

same transmission speed for all devices connectedto the bus.

Parity Bit You cannot edit this parameter because in DH485

communications the parity is always even.

Data Length You cannot edit this parameter because in DH485

communications the length of user data is always

8 bits.

Stop Bits You cannot edit this parameter because in DH485

communications always 1 stop bit is used.


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Configuring Equipment Addresses

OverviewUse the Vijeo-Designer Lite software to configure addresses for the equipment your

XBT terminal should communicate with.

Opening the Equipment Address Dialog Box

To open the Equipment Address dialog box in Vijeo-Designer Lite for configuringDH485 equipment addresses, proceed as follows:


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Step Action

1 Start Vijeo-Designer Lite.

2 From the application browser on the left-hand side of the Vijeo-Designer Lite window select the item

Equipments.

Result: The following dialog box will be displayed on the right-hand side of the Vijeo-Designer Litewindow.

3 In the Equipments dialog box select a slave device from the list.

4 In the Equipment Settings→ Identification box below click the ... button right to the Address text box.

Result: The Equipment Address dialog box will be displayed where you can configure an address for

the selected equipment.


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Equipment Address Dialog Box

PurposeUse this dialog box to configure the address of equipments connected to the

network.

Representation

DH485 equipment address

Elements of the dialog

Element Description

CPU Number Enter the address (between 0 and 31) for the

selected equipment.

OK button Click the OK button to assign the entered address to

the selected equipment.

Cancel button Click the Cancel button to discard the changes and

to close the dialog box.

Help button Click the Help button to open the Vijeo-Designer Lite

online help.


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Variable Types Supported

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Cables and Connectors

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5Cables and Connectors

OverviewThis chapter specifies the cables and connectors required for XBT terminals in

DH 485 applications.



Topic Page

Cables 26

SUB-D 25 Pin Connections 30


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Cables

Technical DataThe following table lists the cables required to connect XBT terminals to the SLC /Micrologix PLCs in multidrop or point-to-point applications.

* XBT RT 511: you must add a XBT ZG939 cable adapter (SUB-D25 RJ45)

XBT RT 500: you must add a XBT ZG939 cable adapter (SUB-D25 RJ45)

and a XBT ZRTPW for power supply.

** XBT RT 500: you must add a XBT ZG939 cable adapter for power supply.

Multidrop Connection Diagram

Connected Device Terminal Physical Link Cable Reference Length

SLC/Micrologix, point-

to-point

XBT N401/N410

XBT R410/R411

RS232 XBT Z9732 2.5 m (8.2 ft.)

(SUB-D25

Micrologix 1000)

XBT RT500/RT511 RS485 XBT Z9734** 2.5 m (8.2 ft.)(RJ45 Micrologix 1000)

SLC/Micrologix,

multidrop

(via 1761-NET-AIC

provided by Allen

Bradley)

XBT N401/N410

XBT R410/R411

RS232 XBT Z9730 2.5 m (8.2 ft.)

(SUB-D25 SUB-D9)

XBT RT500/RT511 XBT Z9741* 2.5 m (8.2 ft.)

(SUB-D25 SUB-D9)

CAUTIONPOWERED CONNECTORS

Connect the serial link and printer link to the XBT with the power OFF.

Failure to follow these instructions can result in injury or equipment damage.


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(*) Provided by Allen Bradley

How to Connect a PC in Point-to-Point Mode to the DH485 Network

CAUTIONPOWERED CONNECTORS

Connect the serial link and printer link to the XBT with the power OFF.

Failure to follow these instructions can result in injury or equipment damage.


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SUB-D 25 Pin Connections

OverviewThe following XBT terminals provide a SUB-D25 connector on their rear panels:

XBT N401

XBT N410

XBT R410

XBT R411

The pin assignment of the SUB-D25 connector is shown in the following figure.


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Wiring

The illustration below shows the wiring:

Rt line impedance matching resistor

NOTE: RP resistors are integrated into the XBT and feature:

4.7 kΩ for XBT N

470 Ω for XBT R

600 Ω for XBT RT


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Diagnostics33004016 03/2009


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6Diagnostics

XBT Detected Error Indication

Overview

XBT terminals indicate detected errors in different ways

by displaying question marks ?????? on alphanumerical fields

by displaying crosses for graphic objects

by displaying hash characters in alphanumerical fields

by blinking alphanumerical fields by issuing system error messages

The following paragraphs list these three detected errors and their possible reasons.

Question Marks and Crosses

When question marks ?????? and crosses XXXXXX are displayed on the display ofyour XBT terminal, a transmission error has occurred. To correct this, check thefollowing:

If... Then ...

question marks are displayed verify that all cables are correctly connected.

question marks are displayed verify that the communication parameters set in the

Protocol - AB DH485 dialog box are identical for all

equipment connected to the bus i.e. same transmission

speed, same use of parity.

question marks are displayed the XBT terminal may have received no response from thePLC.


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Hash Characters

Hash characters displayed in alphanumerical fields on your XBT terminal indicate

that the value to be displayed is too long for this alphanumerical field and cannot

completely be displayed. The value 100 can, for example, not be displayed in a 2-

digit alphanumerical field. To correct this, enter a shorter value or adapt the size of

the alphanumerical field so that it can display any of the possible values of the PLC

variable.

Blinking Alphanumerical Fields

Blinking alphanumerical fields on your XBT terminal indicate that the value of this

field has exceeded or fallen below a user-defined threshold.

System Error Messages

A variety of system error messages is by default configured for the terminals. All

these standard system messages are assigned a panel number 200+x. A distinction

is made between system error messages indicating communication interruptions

and status messages provoked by inputs at the terminal.

These 2 message types differ by the numbers they are assigned and by the waythey are displayed at the terminal as shown in the list below:

System Error

Message Caused by:

System Error Message

Numbers

Display Mode

Communication

Interruptions

201 – 204 To indicate that a communication

interruption has occurred, the message

is displayed in a popup dialog box

every 10 seconds.

Input at Terminal 241 – 258 The status message is displayed as a

response to user input at the terminal.


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Diagnostics

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Messages Caused by Communication Interruptions

Messages 201 to 204 are issued by the terminal to indicate that a communicationinterruption has occurred. They are displayed in a popup dialog every 10 seconds.

Messages Caused by Input at the Terminal

Messages 242 to 254 are issued by the XBT as a response to user input at theterminal. These messages are displayed directly after the operator has sent anincorrect command to the terminal and will persist until the user has corrected the

entered command or value. Messages 255 to 258 are status messages displayedafter the user has initiated an operation at the terminal to indicate that it has (or hasnot) been accepted and is in progress.

If... Then ...

message 201: DIALOG TABLE

AUTHORIZATION INCORRECT is

displayed

the authorization word in the dialog table does not

have the expected value. (Refer to the Vijeo-

Designer Lite online help for information on how

this word is working.) To correct this, verify that:

you are connected to the right PLC

the memory of your PLC is not corrupted

the correct value is saved on the PLCmessage 202: DIALOG TABLE

WRITING IMPOSSIBLE is displayed

the write cycle to the dialog table of the PLC could

not be ended. This condition may have the

following causes:

too much load on the communication bus

EMC disturbances on the communication bus

message 203: DIALOG TABLE

READING IMPOSSIBLE is displayed

the read cycle from the dialog table of the PLC

could not be ended. This condition may have the

following causes: too much load on the communication bus


If... Then ...

message241: IMPOSSIBLE TO READ

VARIABLE is displayed

the terminal has attempted to read a variable and

could not retrieve its value. This condition may

have the following causes:



message 242: IMPOSSIBLE TO

WRITE VARIABLE is displayed

the terminal has attempted to write in a memory

area of the equipment and has received a

negative acknowledgement or no

acknowledgement at all. This condition may have

the following causes:




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RS232/RS485Recommendations

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ARS232/RS485 Recommendations

OverviewThis chapter decribes the RS232/RS485 recommendations.



Topic Page

RS232 Recommendations 40

RS485 Recommendations 41


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RS232/RS485 Recommendations

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RS232 Recommendations

Diagrams for RS232C Link RS232C link

Maximum length for the link is 15 m (49.2 ft.).

Wiring = 3 shielded wires with a minimum cross-section of 0.6 mm2 (AWG22)

NOTE: The maximum length including the RS232 link is 15 m (49.21 ft.), provided

that the equipment connected to the XBT terminal is not subject to more stringent

restrictions (refer to connected devices instruction sheet) and for XBT RT500

provided that the length of the cable is below 10 m (32.8 ft.) (because power is also

supplied by this cable).


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RS485 Recommendations

Diagrams for RS485 Link RS485 link

Maximum length for the link is 1,200 m (3,937 ft.). Wiring = 2 shielded twisted wires with a minimum cross-section of 0.6 mm2

(AWG22) and one 0 V wire

NOTE: The maximum length including the RS485 link is 1,200 m (3,937 ft.),

provided that the equipment connected to the XBT terminal is not subject to more

stringent restrictions (refer to connected devices instruction sheet) and for

XBT RT500 provided that the length of the cable is below 10 m (32.8 ft.) (because

power is also supplied by this cable).


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Glossary

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Glossary

A

AWG

American wire gauge (wire diameter)

F

FCS

frame check sequence

M

Magelis

Generic commercial name of the range of Schneider HMI terminals.

P

PLC

programmable logic controller


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Glossary

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R

RS232

recommended standard for connecting serial devices = EIA/TIA 232

RS485

recommended standard for connecting serial devices = EIA/TIA 485

V

Vijeo-Designer Lite

Configuration software for the low end Magelis range. It replaces the XBT-L1000

software.

X

XBT

Any HMI terminal (when it is not necessary to make a distinction).


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Index

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Vvariable types

DH485 protocol, 23 Vijeo-Designer Lite, 16

Wwiring, 31

XXBT multidrop, 27

XBT Z9730, 26

XBT Z9732, 26

XBT Z9734, 26

XBT Z9741, 26